Multiplex communications – Wide area network – Packet switching
Patent
1992-06-02
1994-01-11
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 161, 371 112, 371 206, H04L 100
Patent
active
052788245
ABSTRACT:
Communications circuit connectivity in a bidirectional line-switched ring transmission system is continued in the presence of the failure of a first ring node for communications circuits terminated in the ring node which are redirectable to an alternate (dual hubbing) ring node. The communications circuit are redirected by establishing a bidirectional communications circuit to the alternate ring node. In one example, redirection of the communications circuits is further realized by not squelching communications circuits terminated in the failed ring node in a ring node adjacent the failed ring node on one prescribed side which normally would have been squelched, while squelching communications circuits terminated in the failed ring node in a ring node adjacent to the other side of the failed ring node. This allows the redirectable communications circuits to be loop back switched so that they may be redirected to the alternate ring node. Then, the alternate ring node directly intercepts the redirected communications circuits. This is realized by providing provisioning information to the ring nodes which includes the identity of all communications circuits active in the ring and whether there is an alternate ring node to which any of the communications circuits may be redirected.
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U.S. patent application, William C. Marra, Ser. No. 07/892,079, filed Jun. 2, 1992.
"SONET Line Protection Switched Ring APS Protocol", T1X1.5/91-026, J. Baroni et al., AT&T Network Systems, Feb. 6, 1991.
"SONET Ring Applications for Survivable Fiber Loop Networks", IEEE Communications Magazine, Jun. 1991, J. Sosnosky et al., pp. 51-58.
"Further Considerations on 2-Fiber Bidirectional Line Switched OC-48 Rings", Contribution to T1 Standards Project--T1X1.5/91-019, G. Copley et al., Feb. 6, 1991.
Co-pending U.S. patent application W. Kremer Case 1, Ser. No. 07/855,795, filed Mar. 26, 1992.
AT&T Bell Laboratories
Marcelo Melvin
Olms Douglas W.
Stafford Thomas
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